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先看一张图，画的很挫，将就看。
TCP 客户端与服务端通信时，是服务端会拿到客户端的socket进行通信。
TCP就相当于以前的座机，有一个听筒和一个话筒，A用话筒说话，B用听筒听。
下面讲讲java中TCP的使用以及步骤。
TCP客户端步骤：
1.建立Socket服务，并确定IP和Port
2.通过socket服务获取输入流或输出流。
3.通输入或输出流操作数据。
TCP服务端的步骤：
1.用ServerSocket来监听Port
2.用accept获取客户端的Socket
3.通客户端的Socket来获取输入和输出流。
4.通过数据流传输。
用一个简单实例演示：
package com.core.net;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
class TcpClient{
public static void main(String[] args) throws Exception {
Socket s = new Socket("localhost", 10004);
OutputStream out = s.getOutputStream();
out.write("tcp come ...".getBytes());
s.close();
}
}
class TcpServer{
public static void main(String[] args) throws Exception {
ServerSocket ss = new ServerSocket(10004);
Socket s = ss.accept();
String ip = s.getInetAddress().getHostAddress();
System.out.println(ip+".....connect");
InputStream in = s.getInputStream();
byte[] buf = new byte[1024];
int len = in.read(buf);
System.out.println(new String(buf,0,len));
s.close();
ss.close();
}
}
public class TcpDemo {
public static void main(String[] args) {
}
}
这个实例只是客服端发送数据，服务器接收数据。
下面是一个例子是客服端发送数据，服务器发送数据。
package com.core.net;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
class Client2{
public static void main(String[] args) throws Exception {
Socket socket = new Socket("localhost", 10004);
OutputStream out = socket.getOutputStream();
out.write("服务端，你好".getBytes());
InputStream in = socket.getInputStream();
byte[] buf = new byte[1024];
int len = in.read(buf);
System.out.println(new String(buf,0,len));
socket.close();
}
}
class Server2{
public static void main(String[] args) throws Exception {
ServerSocket ss = new ServerSocket(10004);
Socket s = ss.accept();
InputStream in = s.getInputStream();
byte[] buf = new byte[1024];
int len = in.read(buf);
System.out.println(new String(buf,0,len));
OutputStream out = s.getOutputStream();
Thread.sleep(10000);
out.write("客服端，你好".getBytes());
s.close();
ss.close();
}
}
public class TcpDemo2 {
public static void main(String[] args) {
}
}
最后一个例子是服务端为大写转换器，客服端输入数据，服务端将输入的数据转换大写。
package com.core.net;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
class TransClient{
public static void main(String[] args) throws Exception {
Socket socket = new Socket("localhost", 10005);
//键盘输入
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
//socket输入流
BufferedReader bufin = new BufferedReader(new InputStreamReader(socket.getInputStream()));
//socket输出流
BufferedWriter bufout = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
String line = null;
while((line = reader.readLine())!=null){
if("over".equals(line))
break;
bufout.write(line);
bufout.newLine();//要注意 "\r\n"
bufout.flush();
String str = bufin.readLine();
System.out.println("server:"+str);
}
reader.close();
socket.close();
}
}
class TransServer{
public static void main(String[] args) throws Exception {
ServerSocket ss = new ServerSocket(10005);
Socket s = ss.accept();
String ip = s.getInetAddress().getHostAddress();
System.out.println(ip+"......connection");
BufferedReader reader = new BufferedReader(new InputStreamReader(s.getInputStream()));
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line = null;
while((line = reader.readLine())!=null){
System.out.println(line);
out.write(line.toUpperCase());
out.newLine();
out.flush();
}
s.close();
ss.close();
}
}
public class TransDemo {
public static void main(String[] args) {
}
}
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原文地址：http://www.cnblogs.com/lzeffort/p/4716534.html
